difficult decision:
Vampire - lots of living.... but quite easy to die
Werewolf - you get sharp claws...... but well i don't see much point of once a month loosing all control and killing things (sounds like periods to me)
or Witch - cool powers.... but everyone would constantly ask you for love potions...

how about a witch that got turned into a vampire??

that might be fun

but hell if i had to choose i'd be witch and not tell anyone about it...

"The medieval chronicler Gervase of Tilbury associated the transformation with the appearance of the full moon, but this concept was rarely associated with the werewolf until the idea was picked up by modern fiction writers."

wiki

*Cough*

That means that werewolves can transform at anytime if im not mistaken